Rotary engine



May 1, 1923.

S. E; KOCHENDARFER ROTARY ENGINE Filed Nov 2 v INVENTOR 'rz'zwflffoch efldarfer,

Arm/mm in}: had to the accompanying drawin 1 which Patented May 1, 1923.

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Z10 dill "whom it concern:

Be itkno'wn that I, SIRIUS 'Koorrnnmnrnn, a citizen of the UnitedStates, and a resident of WVash'i'ngton, in. the county of Washington and State of -Pennsylvania,.have

invented certainnew and useful Iniprove' ments in Rotary Engines, of Whichthe' following is a specification. I

My invention relatesv to improvements in rotary engines, and it consists in the constructions, combinations, and arrangements herein described and claimed.

An object of'myinvention is to provide a rotary engine which embodies improvements over my Patent 1,302,930 of May 6, 1919, and 1,3&4,137 of June 22, 1920, one of the outstanding features of the present construe tron belng an inserted renewable cam orescent with embodied means for controlling the motive fluid as appears more fully below.

A further object of the invention" is to.-

provide a rotary engine embodying means for automatically and gradually cutting ofi the flow of fiuid into the working chamber,

with means consisting of'the mutually asso-.

a stator 1, in which the rotor 2 is concentri-.

oally mounted on the engine shaft 3, which is round at the ends as shown in cross section but non-circular in the middle, as at 4, so that the hub 5 can be mounted with no danger of the rotor turning on'theshaft.

Pivoted at 6 in suitable recesses 7 in the rotor 2, are the oscillating pistons 8, the free ends of which, which have suitable hardened inserts 9, bearingv against the periphery of the working-chamber 10.. y

A so-called cam crescent 11 is inserted in the stator 1 so as to fill one side of the working chamber 10, substantially as shown in Figure 1. In the present instance, the crescent 11 fills the left side.

The ends of the crescent taper out as at 12, but instead of terminatin in knife edges, the ends are substantially thickened at 13 for the double purpose of-lpreventing the fraying out wh ic hqwould certainly occur in the lease ofknife; edges,- and to provide keys, as it were, to seat in the recesses Ligand,

ssist in -holding the crescent 11 inlpothus a sition. v

This cam crescent llis removable, should it become worn,.because it is simplyinser-ted in position and is notfnecess'arily rigidly fixed in place because the nature of its mounting in the stator 1 will'serve to it immovable. It has a large exhaust port 15. at the top and a narrow" inlet port 16 .near' the bottom. I r

This latter port merges with a V-shaped.

recess 17. which gets smaller and smaller toward the bottom in the direction ofrota tion of the rotor, until it finally terminates in a point at the surface of the crescent.

Take forexample the position of the en gine in Figure 1. Steam enters theportlti, flows behind the head 18 of the piston in the recess 19,'thus pressing the free end of the piston in contact with. the periphery of the working chamber, the steam also flowing through the taperingrecess 17 into the working chamber where it exertsits'pressure on i the head 18of the other and uppermost piston. 1

piston inmoving over the tapering steam steam opening until the point of mergence of, the recess with the surface of the crescent 11 is reached, when the steam is entirely out off. That is. to say, the steam isthen cut off v so far as its pressure against the uppermost As the rotation continuespthe' lowermost,

.recess 17 graduallyreduces the area of the 1 piston is concerned, thelowerm'ost piston '1 now being active in moving the rotor. I

Approximately at the. same time of cut.- ting off the steam from the, uppermost piston, that piston reaches the leading edge, 1

of the exhaust port 15, when the exhausting Q 0 1 of the spent. steam commences.v p

The foregoing conveys a full idea of the operation ofthe engine, structural details,

such for example as. how the partsof the sta- 7 tor are/put; together and how the engine is mounted, etc., being omitted, because these arev matters'that are easily taken care of. in

the -manufacture of'theengine. It may be observed, however, that the pistons are held outwardly by means of the plungers 20, i I no 1 pressed by springs'21 in recesses 22 in the rotor. This arrangement is slightly difi'er-m ent fromthe showing in my patent above 'A rotary engine comprising a stator hav to fill one side of the working chamber and coversaid openings, the crescent being tap cred at the ends to provide cam approaches,

one having a large exhaust port fitting over the exhaust opening, the other having a narrow inlet port fitting over the inlet opening and merging with a recess in the face of the crescent which tapers and diminishes in depth in the direction of rotation of the rotor; and a pair of pistons carried by the rotor having means to keep them in contact ith the working chamber wall.

SIRIUS EDWARD KOCHENDARFER; 

